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On the Bi-Axial In-Plane Behavior of Laminated Paperboard Components in Construction: A Representative Engineering Model

Kiziltoprak, Nihat (2022):
On the Bi-Axial In-Plane Behavior of Laminated Paperboard Components in Construction: A Representative Engineering Model. (Publisher's Version)
Darmstadt, Technische Universität Darmstadt,
DOI: 10.26083/tuprints-00021658,
[Ph.D. Thesis]

Abstract

The general objective of the present work is to characterize the material behavior of laminates made of paperboard layers for use in structural engineering and to offer a model for application in design processes. For this purpose, extensive experimental investigations are carried out on laminates for both in-plane and perpendicular to plane loading behavior. Based on the results from the experimental investigations, engineering models are established to represent the material behavior. Simplifications of the Tsai-Wu failure criterion are made via corresponding parameters to represent the in-plane bi-axial strength hypothesis of the investigated laminates with strength values obtained from uni-axial tension and compression tests. In addition, the model is modified to offer a high safety level in the normal/shear stress interaction. The established model is fed into a numerical simulation environment and its suitability for the present paperboard laminate is presented using validation tests. Additionally, case studies are presented in which the collected knowledge and the built engineering model are applied. In a further step, analytical models are presented through which the compressive strength of the laminates can be predicted based on the properties of the individual component layers. The models are based on equilibrium conditions and energy equations which, among other things, take into account shear effects occurring between the individual layers. Finally, testing and design standards are discussed, which do not exist for paper materials in the form known for conventional building materials from construction standards. When comparing the corresponding standards, challenges and opportunities in standardization are highlighted. Based on the established engineering model, a design approach of the laminate for ultimate load calculations in structural engineering is derived. The focus is on a balance between safety, economic efficiency and ecological justifiability.

Item Type: Ph.D. Thesis
Erschienen: 2022
Creators: Kiziltoprak, Nihat
Status: Publisher's Version
Title: On the Bi-Axial In-Plane Behavior of Laminated Paperboard Components in Construction: A Representative Engineering Model
Language: English
Abstract:

The general objective of the present work is to characterize the material behavior of laminates made of paperboard layers for use in structural engineering and to offer a model for application in design processes. For this purpose, extensive experimental investigations are carried out on laminates for both in-plane and perpendicular to plane loading behavior. Based on the results from the experimental investigations, engineering models are established to represent the material behavior. Simplifications of the Tsai-Wu failure criterion are made via corresponding parameters to represent the in-plane bi-axial strength hypothesis of the investigated laminates with strength values obtained from uni-axial tension and compression tests. In addition, the model is modified to offer a high safety level in the normal/shear stress interaction. The established model is fed into a numerical simulation environment and its suitability for the present paperboard laminate is presented using validation tests. Additionally, case studies are presented in which the collected knowledge and the built engineering model are applied. In a further step, analytical models are presented through which the compressive strength of the laminates can be predicted based on the properties of the individual component layers. The models are based on equilibrium conditions and energy equations which, among other things, take into account shear effects occurring between the individual layers. Finally, testing and design standards are discussed, which do not exist for paper materials in the form known for conventional building materials from construction standards. When comparing the corresponding standards, challenges and opportunities in standardization are highlighted. Based on the established engineering model, a design approach of the laminate for ultimate load calculations in structural engineering is derived. The focus is on a balance between safety, economic efficiency and ecological justifiability.
Place of Publication: Darmstadt
Collation: xxxii, 254 Seiten
Uncontrolled Keywords: Building with paper, Failure criteria, Bi-axial strength
Divisions: 13 Department of Civil and Environmental Engineering Sciences
13 Department of Civil and Environmental Engineering Sciences > Institute für Structural Mechanics and Design
Date Deposited: 02 Aug 2022 11:01
DOI: 10.26083/tuprints-00021658
URL / URN: https://tuprints.ulb.tu-darmstadt.de/21658
URN: urn:nbn:de:tuda-tuprints-216581
PPN: 499051130
Referees: Schneider, Prof. Dr. Jens ; Knaack, Prof. Dr. Ulrich
Refereed / Verteidigung / mdl. Prüfung: 4 July 2022
Alternative Abstract:
Alternative abstract Language

Generelles Ziel der vorliegenden Arbeit ist es, das Materialverhalten von Laminaten aus Pappschichten für die Nutzung Bauwesen zu charakterisieren und ein Modell zur Anwendung in Bemessungsvorhaben anzubieten. Dafür werden umfangreiche experimentelle Untersuchungen an Laminaten für sowohl das Verhalten bei Belastungen in der Ebene als auch senkrecht zur Ebene durchgeführt. Basierend auf Ergebnisse der experimentellen Untersuchungen werden Ingenieurmodelle zur Abbildung des Materialverhaltens aufgestellt. Dabei werden Vereinfachungen des Tsai-Wu Versagenskriteriums über entsprechende Parameter vorgenommen, um die biaxiale Festigkeitshypothese in der Ebene der untersuchten Laminate mit Festigkeitswerten aus uniaxialen Zug- und Druckversuchen abzubilden. Außerdem wird das Modell modifiziert, um ein Sicherheitsniveau bei der Normal-/Schubspannungsinteraktion anzubieten. Das aufgestellte Modell wird in eine numerische Simulationsumgebung eingepflegt und dessen Eignung für das vorliegende Laminat aus Pappschichten mit Hilfe von Validierungsversuchen dargelegt. Zusätzlich werden Fallstudien vorgestellt, in denen die gesammelten Erkenntnisse und das aufgebaute Ingenieurmodell Anwendung finden. In einem weiteren Schritt werden analytische Modelle vorgestellt, über die die Druckfestigkeit der Laminate anhand der Eigenschaften der einzelnen Komponentenlagen vorausgesagt werden kann. Die Modelle basieren auf Gleichgewichtsbedingungen und Energiegleichungen, die unter anderem auftretende Schubeffekte zwischen den einzelnen Schichten berücksichtigen. Abschließend wird auf Versuchs- und Bemessungsnormen eingegangen, die für Papiermaterialien in der Form nicht existieren, wie sie für konventionelle Baumaterialien aus Baunormen bekannt sind. Beim Vergleich der entsprechenden Normen werden Herausforderungen und Chancen bei der Normung aufgezeigt. Basierend auf das aufgestellte Ingenieurmodell wird ein Bemessungsansatz des Laminats für Traglastberechnungen im Bauwesen abgeleitet. Dabei wird der Fokus auf ein Gleichgewicht zwischen Sicherheit, Wirtschaftlichkeit und ökologische Vertretbarkeit gelegt.

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